foo.c:2:1: error: unknown type name 'using'
    2 | using namespce std;
      | ^~~~~
foo.c:2:16: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'std'
    2 | using namespce std;
      |                ^~~
foo.c: In function 'main':
foo.c:5:45: error: expected ';' before '}' token
    5 |         printf("还没学过数组，现在就去学！")
      |                                             ^
      |                                             ;
    6 | }
      | ~                                            

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